Unless someone else has mentioned it:
PULSAR - The Strands OF The Future
http://www.progarchives.com/album.asp?id=1126
Even though I've got it here right now on my I-pod, I can't recall if that first side long track is all instrumental? I'm going to give it a listen again right now!
I do remember it doesn't have the greatest recording quality/production, but it still has a very dark spacey sound. It's a Mellotron loaded beast too :)
also
TRIUMVARIT - Illusions On A Double Dimple
http://www.progarchives.com/album.asp?id=1684
Two side long pieces, bit of a favourite of mine, even if it is dismissed a little as an ELP clone.
Edited by Aussie-Byrd-Brother - October 19 2011 at 20:06